Method and device for making geophysical measurements within a wellbore
US4686653A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1984 |
| Grant date | Aug 11, 1987 |
| Priority date | — |
| Expiry date | Dec 4, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V11/005
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method and device for making geophysical measurements in a wellbore comprising a measuring string of a plurality of measuring tools displaced along a borehole wall connected to a surface control unit by a traction system including a cable, guide pulley, connection head and junction box. The measuring tools are displaced at a relative velocity which is equal and opposite to the absolute velocity of the traction system in order to reduce the absolute velocity of the measuring tools to zero during measurement periods. The relative velocity of the tools is in the same direction as the absolute velocity of the traction system between measurement periods, with the result that the absolute velocity of the measuring tools during these periods is higher than the absolute velocity of the traction system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.